`command: 'python.setInterpreter' not found` in VSCode 1.20

[CtrlZvi]

Environment data

VS Code version: 1.20
Python Extension version: 2018.1.0
Python Version: 3.6.4
OS and version: Windows 10 Build 16299

Actual behavior

An error notification saying command: 'python.setInterpreter' not found appears

Expected behavior

Trying to set the python interpreter pulls up a list of interpreter choices.

Steps to reproduce:

• Install VSCode 1.20
• Install Python 3.6.4
• Open a python project with VSCode
• Press Ctrl+Shift+P to pull up the commands and select Python: Select Interpreter

Logs

Output from Python output panel
I discovered this trying to reselect an interpreter to force the plugin to load. There is no Python output panel because the plugin has not successfully loaded.
Output from Console window (Help->Developer Tools menu)

/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:4183 Activating extension `ms-python.python` failed: Cannot find module './banner'.
R._logMessageInConsole @ /C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:4183
/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:253 [Extension Host] Activating extension `ms-python.python` failed:  Cannot find module './banner'
t.log @ /C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:253
/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:253 [Extension Host] Here is the error stack:  Error: Cannot find module './banner'
	at Function.Module._resolveFilename (module.js:470:15)
	at Function.Module._load (module.js:418:25)
	at Function.o._load (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:664:413)
	at Module.require (module.js:498:17)
	at require (internal/module.js:20:19)
	at Object.<anonymous> (C:\Users\viz_s\.vscode\extensions\ms-python.python-2018.1.0\out\client\extension.js:21:18)
	at Object.<anonymous> (C:\Users\viz_s\.vscode\extensions\ms-python.python-2018.1.0\out\client\extension.js:215:3)
	at Module._compile (module.js:571:32)
	at Object.Module._extensions..js (module.js:580:10)
	at Module.load (module.js:488:32)
/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:2925 command 'python.setInterpreter' not found

[DonJayamanne]

Please could you try to uninstall and reinstall the extension.
Looks like some files are missing.

[CtrlZvi]

I'd already tried that, but I just tried again. Not sure if it's the second time that fixed things, or if it's the fact that before I just reloaded the window, and this time I fully closed VSCode (I had another window open both times that wasn't using Python code). But it's working now.

[codeliger]

Uninstalling and reinstalling the plugin fixed the issue for me

[sj4nes]

This problem happens on my system with the 2018.1 (01 Feb 2018) version:

Version 1.20.1
Commit f88bbf9137d24d36d968ea6b2911786bfe103002
Date 2018-02-13T15:34:36.336Z
Shell 1.7.9
Renderer 58.0.3029.110
Node 7.9.0
Architecture x64

The https://github.com/Microsoft/vscode-python extension is the only one enabled in my workspace for testing this. python.startREPL and python.selectLinter give similar errors.

Python 2.7 is located C:\Python27 and Python 3.6 in C:\Program Files\Python36

Windows version is 8.1

[DonJayamanne]

@sj4nes

• Have you tried uninstalling and reinstalling the extension?
• Please disable all extensions globally and test
• Have you confirmed there are no errors in your console window (Help-> Toggle Developer tools)

[sj4nes]

(edit) All other extensions globally disabled, and tried uninstall/reinstall.

Aha, forgive me, I am not familiar with debugging VSCode extensions. There are some errors in the Developer console:

/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:253 [Extension Host] Activating extension `ms-python.python` failed:  Cannot find module 'untildify'
t.log @ /C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:253
/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:253 [Extension Host] Here is the error stack:  Error: Cannot find module 'untildify'
	at Function.Module._resolveFilename (module.js:470:15)
	at Function.Module._load (module.js:418:25)
	at Function.o._load (c:\Program Files\Microsoft VS Code\resources\app\out\vs\workbench\node\extensionHostProcess.js:664:413)
	at Module.require (module.js:498:17)
	at require (internal/module.js:20:19)
	at Object.<anonymous> (C:\Users\simon_000\.vscode\extensions\ms-python.python-2018.1.0\out\client\common\configSettings.js:10:19)
	at Object.<anonymous> (C:\Users\simon_000\.vscode\extensions\ms-python.python-2018.1.0\out\client\common\configSettings.js:331:3)
	at Module._compile (module.js:571:32)
	at Object.Module._extensions..js (module.js:580:10)
	at Module.load (module.js:488:32)
/C:/Program Files/Microsoft VS Code/resources/app/out/vs/workbench/workbench.main.js:4183 Activating extension `ms-python.python` failed: Cannot find module 'untildify'.

[brettcannon]

@sj4nes that suggests your installation is somehow being corrupted as untildify is included in the extension.

[DonJayamanne]

@sj4nes here's the solution:

Have you tried uninstalling and reinstalling the extension?